dotf   string
		dotErr error
	)
	if _, found := syscall.Getenv("NoDefaultCurrentDirectoryInExePath"); !found {
		if f, err := findExecutable(filepath.Join(".", file), exts); err == nil {
			if execerrdot.Value() == "0" {
				execerrdot.IncNonDefault()
				return f, nil
			}
			dotf, dotErr = f, &Error{file, ErrDot}
		}
	}

	path := os.Getenv("path")
	for _, dir := range filepath.SplitList(path) {
		if dir == "" {

	for _, dir := range filepath.SplitList(path) {
		path := filepath.Join(dir, file)
		if err := findExecutable(path); err == nil {
			if !filepath.IsAbs(path) {
				if execerrdot.Value() != "0" {
					return path, &Error{file, ErrDot}
				}
				execerrdot.IncNonDefault()
			}
			return path, nil
		}
	}
	return "", &Error{file, ErrNotFound}
}

// lookExtensions is a no-op on non-Windows platforms, since

			dir = "."
		}
		path := filepath.Join(dir, file)
		if err := findExecutable(path); err == nil {
			if !filepath.IsAbs(path) {
				if execerrdot.Value() != "0" {
					return path, &Error{file, ErrDot}
				}
				execerrdot.IncNonDefault()
			}
			return path, nil
		}
	}
	return "", &Error{file, ErrNotFound}
}

// lookExtensions is a no-op on non-Windows platforms, since

// (Otherwise the test in this package will fail.)
var All = []Info{
	{Name: "asynctimerchan", Package: "time", Changed: 23, Old: "1", Opaque: true},
	{Name: "execerrdot", Package: "os/exec"},
	{Name: "gocachehash", Package: "cmd/go"},
	{Name: "gocachetest", Package: "cmd/go"},
	{Name: "gocacheverify", Package: "cmd/go"},
	{Name: "gotypesalias", Package: "go/types", Changed: 23, Old: "0"},

	// command completed, or no WaitDelay was set, or the WaitDelay already
	// expired and its effect was already applied.)
	timer *time.Timer
}

var execwait = godebug.New("#execwait")
var execerrdot = godebug.New("execerrdot")

// Command returns the [Cmd] struct to execute the named program with
// the given arguments.
//
// It sets only the Path and Args in the returned structure.
//

There is no plan to remove any of these settings.

### Go 1.19

Go 1.19 made it an error for path lookups to resolve to binaries in the current directory,
controlled by the [`execerrdot` setting](/pkg/os/exec#hdr-Executables_in_the_current_directory).
There is no plan to remove this setting.

### Go 1.18

Go 1.18 removed support for SHA1 in most X.509 certificates,

	/gc/stack/starting-size:bytes
		The stack size of new goroutines.

	/godebug/non-default-behavior/execerrdot:events
		The number of non-default behaviors executed by the os/exec
		package due to a non-default GODEBUG=execerrdot=... setting.

	/godebug/non-default-behavior/gocachehash:events
		The number of non-default behaviors executed by the cmd/go
		package due to a non-default GODEBUG=gocachehash=... setting.

}

// TODO: It would be nice if ExecError was more broken down, but
// the way ErrorContext embeds the template name makes the
// processing too clumsy.

// ExecError is the custom error type returned when Execute has an
// error evaluating its template. (If a write error occurs, the actual
// error is returned; it will not be of type ExecError.)
type ExecError struct {
	Name string // Name of template.

	// First, a non-execution error shouldn't be an ExecError.
	tmpl, err := New("X").Parse("hello")
	if err != nil {
		t.Fatal(err)
	}
	err = tmpl.Execute(ErrorWriter(0), 0)
	if err == nil {
		t.Fatal("expected error; got none")
	}
	if err.Error() != alwaysErrorText {
		t.Errorf("expected %q error; got %q", alwaysErrorText, err)
	}
	// This one should be an ExecError.
	tmpl, err = New("X").Parse("hello, {{.X.Y}}")

	// First, a non-execution error shouldn't be an ExecError.
	tmpl, err := New("X").Parse("hello")
	if err != nil {
		t.Fatal(err)
	}
	err = tmpl.Execute(ErrorWriter(0), 0)
	if err == nil {
		t.Fatal("expected error; got none")
	}
	if err.Error() != alwaysErrorText {
		t.Errorf("expected %q error; got %q", alwaysErrorText, err)
	}
	// This one should be an ExecError.
	tmpl, err = New("X").Parse("hello, {{.X.Y}}")